Improvement in rocking-grate bars



. To all whom it may concern:

NI'IED STATES PATENT FFIGE.

-JAMES onas, ornoonnstrnn, NEW YORK.

TIM'PROVEMENT IN ROCKlNG-GRATE BAMRS.

Specification forming part of Letters Patent No. 115,482, dated May 30, 1871.

Be it known that LJAMES JoNEs, of the city of Rochester, in the county of Monroe and State of New York, have invented a new and useful Improvement in Grate-Bars; and

-I do hereby declare that the following is a represents the under side of one grate-bar.

without the braces. Fig. 3 represents a side view of thegrate-bar, exhibiting its trussand one brace. Fig. erepresents a transverse section of Fig. 2.

The object of my invention is to produce a l grate-bar equallywell adapted for burning fine or coarse fuel, and which may be used in furnaces forxburning coal-dust, screenings, and other similar fine fuel, as well as for the ordinary lnmp-coaL- I will describe the several distinguishing features in the construction of my grate-bar with reference to the accompanying drawing. Thecentral longitudinal shaft or axle A is provided with journal 0 at each end, which i will support it in suitable hearings in the grate-frame. of a furnace. The shaft A is cast with segmental spiral flanges b b, and with the longitudinal truss O and lateral braces 01.

The segmental flanges constitute sections of a screw-thread, which terminate at s s at each side of the truss O. The truss 0 serves as a support to prevent the grate-bar from deflecting out of line; and. between it and the ends s sof the flangesb' btwo Vshaped recesses are formed at the underside of the bar, de-

noted by the letterll in Fig. 4, to admit the discharge of ashes or cinders, and for. the free communication of air with the central shaft A throughout its length. The segmental spiral flanges b b are made thicker at their peripheriesthan they are where joined with the shaft A, and the spacesbetween them increase .inlwidth and capacity from the periphery of the grate-bar to the shaft, as is represented in Fig. '2 'oft'he drawing.

Forming these spaces between the spiral flanges in this manner, with enlarged dimensions at the intersection of' the flanges with the axle A, prevents the lodgment of cinders or ashes between them, and consequently avoids all liability of clogging the grate and burning it out, and also insures free access of air toall the surfaces of the grate-bar excepting the peripheries of the flanges b b, upon which the fuel rests. The truss G is of sufficient width, radially, to the shaft A to serve as a stop,

which will strike against the adjacent gratebars and limit the extent of movement when the grate-bar is oscillated upon its journals to discharge ashes and open the fuel in the furnace. The trusses G of several grate-bars may be connected by, a pivoted bar or rod, so that the oscillating motion of one grate-bar will be communicated to all the others so connected together. The truss is supported centrally by braces d, (one on each side,) which are continuations of one of the central spiral flanges b.

The action ofthe spiral flanges on themass a of charred fine fuel to agitate it is not violent when the grate is oscillated, like the effect produced by bars having an irregular surface, and consequently they will not greatly derange or disturb the burning fuel and cause it to fall through the grate; but these spiral flanges act longitudinally upon the mass, causing seams or crevices to be opened in the charred mass of fine fuel, through which air will be drawnor forced to promote the combustion;

My grate-bars can be successfully used for burning mixed fuels, coarse and fine screenings of coal with sawdust, and either of these kinds of fuel, separately, may be burned upon my. grate-bars by the use ofa blower without subjecting the bars to undue heat.

The spaces between the spiral segmental flanges being of the form described, any substance of a size which would enter between the flanges at their peripheries would be readily discharged by the gentlest oscillation of the grate-bars.

Having fully described my improved gratebar, I claim and desire to secure by Letters Patent as my invention-- 1. The combination, in a grate-bar, of the segmental spiral flanges b b with the axle A, substantially as and for the purpose described.

2. The arrangement of the truss O in relation to the ends .9 s of the flanges I) I so as to In testimony hereof I have hereunto setmy form the two draft and discharge spaces 1 I, hand this 16th day ofMnrch, A. D. 1871. in the manner and for the purpose described.

3. The grate-bar in which the axle A, flanges b b, truss O, and braces 61 are employed in Witnesses: combination, substantially as described, for the purpose specified.

JAMES JONES.

H. P. K. PEoK, A. L. IECK. 

